LXR uboot/post/board/lwmon5/watchdog.c

   1/*
   2 * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
   3 *
   4 * Developed for DENX Software Engineering GmbH
   5 *
   6 * SPDX-License-Identifier:     GPL-2.0+
   7 */
   8
   9#include <common.h>
  10
  11/* This test verifies if the reason of last reset was an abnormal voltage
  12 * condition, than it performs watchdog test, measuing time required to
  13 * trigger watchdog reset.
  14 */
  15
  16#include <post.h>
  17
  18#if CONFIG_POST & CONFIG_SYS_POST_WATCHDOG
  19
  20#include <watchdog.h>
  21#include <asm/ppc4xx-gpio.h>
  22#include <asm/io.h>
  23
  24static uint watchdog_magic_read(void)
  25{
  26        return in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
  27                CONFIG_SYS_WATCHDOG_MAGIC_MASK;
  28}
  29
  30static void watchdog_magic_write(uint value)
  31{
  32        out_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR, value |
  33                (in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
  34                        ~CONFIG_SYS_WATCHDOG_MAGIC_MASK));
  35}
  36
  37int sysmon1_post_test(int flags)
  38{
  39        if (gpio_read_in_bit(CONFIG_SYS_GPIO_SYSMON_STATUS) == 0) {
  40                /*
  41                 * 3.1. GPIO62 is low
  42                 * Assuming system voltage failure.
  43                 */
  44                post_log("sysmon1 Abnormal voltage detected (GPIO62)\n");
  45                post_log("POST sysmon1 FAILED\n");
  46                return 1;
  47        } else {
  48                post_log("sysmon1 PASSED\n");
  49        }
  50
  51        return 0;
  52}
  53
  54int lwmon5_watchdog_post_test(int flags)
  55{
  56        /* On each reset scratch register 1 should be tested,
  57         * but first test GPIO62:
  58         */
  59        if (!(flags & POST_MANUAL) && sysmon1_post_test(flags)) {
  60                /* 3.1. GPIO62 is low
  61                 * Assuming system voltage failure.
  62                 */
  63                /* 3.1.1. Set scratch register 1 to 0x0000xxxx */
  64                watchdog_magic_write(0);
  65                /* 3.1.2. Mark test as failed due to voltage?! */
  66                return 1;
  67        }
  68
  69        if (watchdog_magic_read() != CONFIG_SYS_WATCHDOG_MAGIC) {
  70                /* 3.2. Scratch register 1 differs from magic value 0x1248xxxx
  71                 * Assuming PowerOn
  72                 */
  73                int ints;
  74                ulong base;
  75                ulong time;
  76
  77                /* 3.2.1. Set magic value to scratch register */
  78                watchdog_magic_write(CONFIG_SYS_WATCHDOG_MAGIC);
  79
  80                ints = disable_interrupts ();
  81                /* 3.2.2. strobe watchdog once */
  82                WATCHDOG_RESET();
  83                out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, 0);
  84                /* 3.2.3. save time of strobe in scratch register 2 */
  85                base = post_time_ms (0);
  86
  87                /* 3.2.4. Wait for 150 ms (enough for reset to happen) */
  88                while ((time = post_time_ms (base)) < 150)
  89                        out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, time);
  90                if (ints)
  91                        enable_interrupts ();
  92
  93                /* 3.2.5. Reset didn't happen. - Set 0x0000xxxx
  94                 * into scratch register 1
  95                 */
  96                watchdog_magic_write(0);
  97                /* 3.2.6. Mark test as failed. */
  98                post_log("hw watchdog time : %u ms, failed ", time);
  99                return 2;
 100        } else {
 101                /* 3.3. Scratch register matches magic value 0x1248xxxx
 102                 * Assume this is watchdog-initiated reset
 103                 */
 104                ulong time;
 105                /* 3.3.1. So, the test succeed, save measured time to syslog. */
 106                time = in_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR);
 107                if (time > 90 ) { /* ms*/
 108                        post_log("hw watchdog time : %u ms, passed ", time);
 109                        /* 3.3.2. Set scratch register 1 to 0x0000xxxx */
 110                        watchdog_magic_write(0);
 111                        return 0;
 112                } else {
 113                        /*test minimum watchdogtime */
 114                        post_log("hw watchdog time : %u ms, failed ", time);
 115                        return 2;
 116                }
 117        }
 118        return -1;
 119}
 120
 121#endif /* CONFIG_POST & CONFIG_SYS_POST_WATCHDOG */
 122